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This is a preparatory step. Instead of using memory-based access,
we might want to retrieve SID keys (e-fuses) via SID registers.
For this, it's convenient if the plain base address is available.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

open_fel_device() will automatically provide this member field,
based on the SoC ID from FEL/BROM version data. The field will
either receive a human-readable identifier, or the ID in 4-digit
hexadecimal representation (for unknown SoCs).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

While at it, modify the former "sram_info" identifiers
to carry a broader "soc_info" meaning.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>